Cross-linking dots on metal oxides

Ramachandran, Roshini; Jung, Dahee; Spokoyny, Alexander M.

doi:10.1038/s41427-019-0119-9

Cited by 16 publications

(14 citation statements)

References 20 publications

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“…From the distinct combinations of M x O y with, e.g., certain polysaccharides or peptides and proteins in biogenic M x O y materials, one can infer with high certainty that a combination of closely related materials will also exhibit good compatibility. Indeed, the recent developments in the field of cross-linked metaloxides particles uses polysaccharides cross-linkers such as alginate [206]. Several examples of so-called 'extreme biomimetic' synthesis have exploited the generation of M x O y -polysaccharide composites by extremophile organisms [6], to generate, e.g., chitin/SiO 2 [207], chitin/ZnO [208], and chitin/ZrO 2 [209].…”

Section: Biomimetics Of Biogenic Metal Oxide Structures and Further I...mentioning

confidence: 99%

Biogenic Metal Oxides

Moura

Unterlass

2020

Biomimetics

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Biogenic metal oxides (MxOy) feature structures as highly functional and unique as the organisms generating them. They have caught the attention of scientists for the development of novel materials by biomimicry. In order to understand how biogenic MxOy could inspire novel technologies, we have reviewed examples of all biogenic MxOy, as well as the current state of understanding of the interactions between the inorganic MxOy and the biological matter they originate from and are connected to. In this review, we first summarize the origins of the precursors that living nature converts into MxOy. From the point-of-view of our materials chemists, we present an overview of the biogenesis of silica, iron and manganese oxides, as the only reported biogenic MxOy to date. These MxOy are found across all five kingdoms (bacteria, protoctista, fungi, plants and animals). We discuss the key molecules involved in the biosynthesis of MxOy, the functionality of the MxOy structures, and the techniques by which the biogenic MxOy can be studied. We close by outlining the biomimetic approaches inspired by biogenic MxOy materials and their challenges, and we point at promising directions for future organic-inorganic materials and their synthesis.

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Section: Biomimetics Of Biogenic Metal Oxide Structures and Further I...mentioning

confidence: 99%

Biogenic Metal Oxides

Moura

Unterlass

2020

Biomimetics

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“…Magnetite is a metal oxide hybrid that consists of organic and inorganic constituents and crosslinkers that promote ion transport at the material interface (Ramachandran et al, 2019). Magnetite chitosan was synthesized well by a precipitation method using iron chloride as a precursor and the addition of chitosan.…”

Section: Chitosan-fe3o4 Synthesis and Characterizationmentioning

confidence: 99%

“…By this reaction, the enzyme is covalently bonded to the metal in a reaction between the amino acid functional groups and the metal oxide. A dispersing agent helps to build the covalent bond space on the magnetite surface (Ramachandran et al, 2019). Upon addition of glutaraldehyde, the mixture is then washed several times with a buffer, followed by reaction with enzymes to form covalent bonds between the enzyme and the support material.…”

Section: Chitosan-fe3o4 Synthesis and Characterizationmentioning

confidence: 99%

Immobilization of Cholesterol Oxidase in Chitosan Magnetite Material for Biosensor Application

Perdani¹,

Juliansyah²,

Putri³

et al. 2020

IJTech

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Cholesterol oxidase, a bio-catalyst that can catabolize cholesterol, has proven applications in medicine. Here, a support material was used to enhance the characteristics of the enzyme. Magnetite (Fe3O4) is widely used as an enzyme support; however, the interaction between the enzyme and the support should be capped with another material, such as chitosan biopolymerbased material. In this study, chitosan-magnetite materials were synthesized by mixing both compounds and activating with glutaraldehyde. The materials were then characterized by Fourier Transform Infrared (FTIR) Spectroscopy. The enzyme kinetic parameters were studied by following the cholesterol oxidation reaction using high-performance liquid chromatography (HPLC) and comparing the results between the free and the immobilized enzyme. The substrate concentration was 2.5 mg/mL. The effect of enzyme concentration was tested using different concentrations of enzyme (0.5, 1, and 2 mg/mL) to determine the best operating conditions. The best conditions for the oxidation reaction were immobilized enzyme at a 2 mg/mL concentration. Enzyme immobilization significantly decreased the optimum substrate concentration to 0.1 mg/mL.

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“…1d). Considering that the molecular cross-linking approach promotes a synergy of the functionalities of the material and cross-linker, 23 we executed this strategy with tungsten oxide aiming to create a supercapacitor electrode. Our work shows that the incorporation of the robust molecular cross-linker, I, into the tungsten oxide network generates a chemically stable hybrid material, which significantly enhances the long-term cycling stability in the electrochemical reactions.…”

Section: Introductionmentioning

confidence: 99%